> The most efficient device you have would be your electric kettle.  Its sole
> purpose in life is to turn electricity into heat, and it does that very
> well.  It would be 100% efficient except you lose a little bit in the cable,
> but never mind.  Plonk a Stirling engine on top to capture the waste heat,
> it can power your coffee grinder.
>
> Tony
>
 Not quite true. A heat pump can run up to about 300% efficient in heating mode.

RP
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